linux-kernel - Re: [PATCH net] hyperv: Fix vlan_proto setting in netvsc_recv

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Message-ID: <20130614152843.GA11368@aepfle.de>
Date:	Fri, 14 Jun 2013 17:28:43 +0200
From:	Olaf Hering <olaf@...fle.de>
To:	Haiyang Zhang <haiyangz@...rosoft.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, kys@...rosoft.com,
	jasowang@...hat.com, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org
Subject: Re: [PATCH net] hyperv: Fix vlan_proto setting in
 netvsc_recv_callback()

On Tue, May 28, Haiyang Zhang wrote:

> Since the recent addition of 8021AD, we need to set the new field vlan_proto in
> sk_buff. Otherwise, it will trigger BUG() call in vlan_proto_idx().

> @@ -284,7 +285,7 @@ int netvsc_recv_callback(struct hv_device *device_obj,
>  
>  	skb->protocol = eth_type_trans(skb, net);
>  	skb->ip_summed = CHECKSUM_NONE;
> -	skb->vlan_tci = packet->vlan_tci;
> +	__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), packet->vlan_tci);


Just curious:

Doesnt that change behaviour in the sense that __vlan_hwaccel_put_tag()
now always adds VLAN_TAG_PRESENT to skb->vlan_tci, while before that
change packet->vlan_tci may or may not had this flag?

In other words, should a variant of this patch be backported if it was a
bug not not use __vlan_hwaccel_put_tag right from the start?

Olaf
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